Requests from this Android client application <empty> are blocked

Hi all,
When i tried to translate the text with Google Cloud API but i got a message :
{
"error": {
"code": 403,
"message": "Requests from this Android client application \u003cempty\u003e are blocked.",
"errors": [
{
"message": "Requests from this Android client application \u003cempty\u003e are blocked.",
"domain": "global",
"reason": "forbidden"
}
],
"status": "PERMISSION_DENIED"
}
}

I don't know how to fix this issue , plz tell me if you have any solution.
Thanks

It looks like you aren't doing auth correctly. Are you setting an API key?

I setting and using Android key then got above message . I tried public key then ok . I don't know why Android key i can't use it.

@thanhlv93 are you still experiencing this problem? If so, could you share the code you're using for authentication to help us diagnose the issue? Thanks!

@tcoffee-google

@tcoffee-google yeah , i still this problem and i'm using public key instead private key.

@thanhlv93 it would help us to see the code you were using for authentication that was producing the error message.

Closing this issue due to lack of context --- @thanhlv93 please re-open if you can provide additional information. Thanks!

same issues here
working perfectly in my local emulator when restricted as None in google console
But if I changed it into Android same error got

add debug key and package name correctly (100% sure) in google console save and wait more than 5 minutes to update
debug key and package name is ok and i double-check with my android code is with getting its programmatically
use com.google.apis:google-api-services-youtube lib (java) for call services from android side
API key also double check and its correct

E/ServiceRequestTask: mLastError: com.google.api.client.googleapis.json.GoogleJsonResponseException: 403 Forbidden
    GET https://www.googleapis.com/youtube/v3/videos?chart=mostPopular&key=***********************&maxResults=10&part=snippet,contentDetails,statistics&regionCode=US
    {
      "code" : 403,
      "errors" : [ {
        "domain" : "global",
        "message" : "Requests from this Android client application <empty> are blocked.",
        "reason" : "forbidden"
      } ],
      "message" : "Requests from this Android client application <empty> are blocked.",
      "status" : "PERMISSION_DENIED"
    }
E/MainActivity: error: 400